chore(deps): update tabbyml/tabby docker tag to v0.28.0

[renovate]

This PR contains the following updates:

Package	Update	Change
tabbyml/tabby	minor	0.27.0-rc.0 -> 0.28.0-rc.0

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Release Notes

TabbyML/tabby (tabbyml/tabby)

v0.27.1

Compare Source

Notice

• This is a patch release, please also check the full release note for 0.27.

Fixed and Improvements

• Resolved an issue where certain escaped characters could cause plugin crashes on Windows systems. (#​4114)
• Resolved an issue where the Tabby server could hang while waiting for the registry file to download in offline environments. (#​4120)
• Improved handling of file mentions from different sources in the Chat Panel. (#​4116)

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Configuration

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